Stop mechanism for punch presses



Nov. 6, 1956 w. A. KARSOE 2,769,493

STOP MECHANISM FOR PUNCH PRESSES Filed April 7, 1955 3 Sheets-Sheet lINVENTOR W. A. KA RSO E ATTORNEYS Nov. 6, 1956 w. A. KARSOE STOPMECHANISM FOR PUNCH PRESSES 3 Sheets-Sheet 2 Filed April 7', 1955 6 IINVENTO R WA. KAIQS E ATTORNEYS Nov. 6, 1956 w. A. KARSOE STOP MECHANISMFOR PUNCH PRESSEIS 5 Sheets-Sheet 3 Filed April 7, 1955 INVENTOR W. A. KA RSOE BY @W!% ATTORNEYS United States Patent STOP MECHANISM FOR PUNCHPRESSES Willart A. Karsoe, Flint, Mich. Application April 7, 1955,Serial No. 500,009

3 Claims. (Cl. 164-59) This invention relates to an attachment for punchpresses, and more specifically, the invention is directed to theprovision of a stop mechanism associated with the die of the press forgaging the intermittent movement of the stock as the stock is manuallyor automatically moved through the die for each successive punchingoperation.

One of the primary objects of this invention is to provide a materialstop gage which is positive in operation, and which is accurate in thegaging of material as the same is used in manufacturing operationsemploying the use of progressive and blanking operation dies.

A further object of this invention is to provide a stop gage of the typeto which reference has been made above, the gage eliminating thenecessity for lifting material thereover as is required in prior artdevices of a related nature, whereby the operator has the free use ofhis hands during the operation of each press cycle.

A still further object of this invention is to provide a positivelyoperated material stop device together with means which areautomatically operative to release the material freeing the same tocontinue in motion.

Other and further objects and advantages of the instant invention willbecome more evident from a consideration of the following specificationwhen read in conjunction with the annexed drawings, in which:

Figure l is an exploded perspective view of a material stop gageconstructed in accordance with one embodiment of this invention.

Figure 2 is a medial longitudinal cross-sectional View of the gageillustrated in Figure 1.

Figure 3 is a cross-sectional view taken on the vertical plane of line33 of Figure 2, looking in the direction of the arrows.

Figure 4 is an exploded perspective view of a material stop gageconstructed in accordance with a second embodiment of this invention.

Figure 5 is a side elevational view of the gage illustrated in Figure 4with a side wall thereof having been removed.

Figure 6 is a cross-sectional view taken on the vertical plane of line6-6 of Figure 5, looking in the direction of the arrows.

Figure 7 is an exploded perspective view of a third embodiment of thisinvention.

Figure 8 is a cross-sectional view, partly in side elevation, taken onthe vertical plane of line 88 of Figure 9, looking in the direction ofthe arrows.

Figure 9 is a cross-sectional view taken on the vertical plane of line99 of Figure 8, looking in the direction of the arrows.

Figure 10 is a bottom plan view illustrated in Figures 7, 8 and 9,thereof.

Referring now more specifically to the drawings, reference numeral 29designates, in general, one embodiment of a material stop gageconstructed in accordance with the teachings of this invention. Asillustrated in of the gage housing prior to the closing "ice Figures 1to 3, inclusive, the gage 20 is seen to comprise a pair of elongatedsubstantially rectangular side walls 22, 24, of which the side wall 22is provided with an outwardly turned integrally formed elongated and substantially rectangular flange 26 at the lower'end thereof and spacedinwardly from the forward end 28 thereof. A similar flange 30 is alsoformed on the lower end of the side wall 22 and is spaced inwardly fromthe rear end 32 thereof, the flanges 26 and 30 being aligned each other.V

The rear end 32 of the side wall 22 is provided with a laterallyinwardly extending integrally formed tab 34 adjacent to but spaced belowthe upper end of the side wall 22. A lip 36 is integrally formed withthe upper, end of the side wall 22 and projects laterally and iii"-wardly of the gage 29, the lip being disposed intermediate the front andrear ends 28, 32, respectively, of the side wall 22. The upper end ofthe front end 28 of the wall 22 terminates in a longitudinally extendingsubstantially V-shaped projection 33 integrally formed therewith andhaving an upwardly inclined face 40 extending rearwardly from its apex43.

A pair of vertically aligned tapped openings 42, 44 extend transverselythrough the side wall 22 adjacent the rear end 32 thereof. A tappedopening 46 is horizontally aligned with the opening 44, and a fourthtapped opening 48 is horizontally aligned with the opening 42.

The side wall 22 is completed by forming a transversely extending dowelpin opening 50 therein adjacent the upper end thereof intermediate theends of the wall by forming a second transversely extending dowel pinopen ing 52 therein substantially intermediate the upper and lower endsthereof and intermediate the front and rear ends thereof, and byproviding a longitudinally extending arcuately shaped expressed portion54 which extends inwardly from a point adjacent the rear end 32 thereofto a terminal point intermediate the front and rear. ends 28, 32,respectively, thereof. h

The side wall 24 is provided with three integrally formed laterally andinwardly extending flanges 56, 58

and 60, substantially rectangular in configuration, the

flange 56 being disposed adjacent the front end 62, the flange 58 beingpositioned adjacent the rear end 64, and the flange 60 being locatedsubstantially intermediate the flanges 56, 58. An outwardly andlaterally extending flange 66 is positioned intermediate the flanges 56,60,

and a similar flange 68, also outwardly and laterally extending, isinterposed intermediate the flanges 58 and 60. As is seen in thedrawings, the flanges 56, 58 60,66 and 68 are horizontally aligned. I j

A rear end tab 70 is integrally formed with the side Wall 24 and ispositioned adjacent to but slightly spaced from the flange 58. A lip 72extends laterally inwardly from the upper end of the wall 24, and asubstantially centrally positioned lip 74 also extends laterally andinwardly therefrom.

The upper end of the front end 62 of the wall 24 terminates in alongitudinally extending substantially V-s'haped projection 76.integrally formed therewith and having an upwardly inclined surfaceextending rearwardly from its apex 78.

A pair of vertically aligned openings 80, 82 extend.

vided with a longitudinally extending arcuately shaped expressed portion92 which extends inwardly from a point 7 ifng y inser'ting the lip 36between the lips 72, 74 for engagement withlthe inner side of thesidewall 24 and causmg the flanges 56, 58' and 60 to abut against theadjacent'side of the wall 22. In this position the pairs of and the.sides are held releasably secured together by screws 94 which extend through each of the pairs of aligned openings. V

V In this assembled position the lip overlies the tab 34 which extendsover and is parallel to the tab 70, and the expressed portions 54 and 92are longitudinally aligned in spaced confronting relation to form aguideway in which an elongated substantially cylindrical member 96having an end closure wall 98, is mounted for reciprocation. One end ofa helicoidal spring 100 engages the tab 70 while the other end thereofabuts against the closure wall 98 which, in turn, is constantly biasedfor engagement toward a normally vertically extending rear side 102 ofan elongated polygonal plate 104. The plate 104 is provided with anelongated slot 106 which receives therethrough a dowel pin108 supportedat its opposite ends in the dowel pin openings 52, 90. The major axis ofthe slot 106 is normally positioned at an angle of substantially withrespect to the horizontal diameter of the dowel pin 108.

The front side 1100f the plate 104 is substantially parallel to the rearside 102, and the upper end 112 is substantially perpendicular to boththe front and rear sides 110 and 102, respectively. The two inwardlyconverging sides 114, 116 form an obtuse angle with the side 116extending at an angle of substantially 45 with respect to the front andrear ends, and is normally maintained at an angle of 45 with respect toa vertical projection of the vertical diameter of the dowel 118 whichengages the sides 114, 116 adjacent the line of junction thereof andprohibits the counter-clockwise rotation of the plate 104 to reduce thedescribed angle'of 45 As is seen in the drawings, the opposed ends ofthe dowel pin 118 rest in the opposed and aligned dowel pin openings 50,88.

The assembled gage is fixedly secured on a die shoe (not shown) by meansof a pair of brackets .120 which are notched at 122 to form flanges 124under cut at 126 for engagement over the flanges 26, 30, 66 and 68, thebrackets being mounted on the shoe by means of the screws 128.

In operation, are initially in the full line positions shown in Figure 2of the drawings. A sheet of material 130 is fed into the die until theleading end thereof engages the faces 40, 79 formed on the inclinedfaces 40, 79 tend to elevate the sheet of material 130 until the sameengages the front end 110 of the plate 104 die is then operated, andthereafter the pressurepad 132 movesdownwardly, and at this movement iseffected, the front end 110 is moved downwardly and the plate 104 slidesrearwardlyon the dowel pin 108 and pivots thereon until the corner 112Aformed at the junction of the front end 110 with the upper end 112clears the lower edge of the material 130. The upper end 112 thenengages the leading end of the sheet 130 and holds the sheet motionlessuntil the pressure pad 132 completes its downward movement at the uppersurface of the sheet of material At this time, the material 130 is freeto move to its next station, and the plate wardly thereunder to'maintainabutting engagement of the upper end 112 with the under side ofthe material 130. After thematerial 130 has cleared the, gage. 2 0, theP ate 04. pi ots 1 p.u .1 y.t9 the' u l. '4: P s i n swa the gage 20 andits associated elements the projections 38,, 76. At this time,

104 moves upwardly and for- V openings 42,80; 44, 82; 46, 84; and 48, 86are aligned,

at substantially right angles thereo. The V in Figure 2 above theinturned lips 36,- 72 and 74, the 7 pressure pad 132 in the meantime,having been returned to its original position.

Referring now to the second embodiment of this invention which isillustrated in Figures 4 to 6, inclusive, it is seen that the gagedesignated, in general, by the reference numeral 200 comprises asubstantially rectangular side wall 202 having a pair of opposed frontand rear ends 204 and 206,. respectively. 'As in the precedingembodiment, the front end of the front wall 204 terminates in alongitudinally extending'V-shaped projection 208 4 having an apex210-and an upwardly and rearwardly inclined surface 212. A plurality ofcounter-bored holes 214 extendtransversely through the side wall 202 andare adapted to receive therethrough a plurality of bolts 216. r

The side wall 202 is formed with a longitudinally extending rabbet 218,the function of which will be described below. I

Additionally, the side wall 202 is formed with two transverselyextending dowel pin receiving openings 220 and 222, respectively. Theinner side of the side wall 202 is provided with a longitudinallyextending arcuately shaped groove 224.

The second side wall 226 of the gage 200 is substantially rectangularinconfiguration and has a pair ofopposed front and rear ends 228 and230, respectively. As in the construction of the 228 of the side wall226 is provided with a longitudinally an apex 234 and an upwardly andrearwardly inclined face or surface 236. The outer side of the, sidewall.

226 is provided with a longitudinally extending rabbet 238 which ispositioned substantially parallel to the rabbet 218 formed in the sidewall 202. A plurality of tapped openings 240 are formed in the side wall226. and are adapted to threadedly receive the screws 216 in order tosecure the two side walls together.

The side wall 226 has a notch formed therein which extends inwardly fromthe front end 228 and the projection 232, the notch forming a flange 242adjacent the lower end thereof, the flange terminating in a reduced step244 adjacent the inner'end thereof. The side wall 226 is under cut at246 to form a top wall 248, and the side wall 226 is recessed inwardlyfrom the lower end thereof to'form a shoulder 250 which extends upwardlyto thetopwall 248. V

The side wall 226 has a longitudinally extending arcuate groove 252which extends inwardly from the front end 228 thereof and communicatesat its inner end with an arcuate groove 254 of greater extent than thegroove 252. The outer end of the groove 254 terminates adjacent the rearend 230. I

The forward end of the top wall 248 is provided with an arcuately shapedrecess 256 which, at its inner end, connects with the inner end of adowel pin opening 258, and the side wall 226 is also provided with asecond dowel pin opening 260. i

In its assembled form, the dowel. pin opening 222 is adapted to becoaxially aligned with the arcuately shaped When assembled, the sidewalls 202, 226 are disposed in juxtaposed position, and the groove 224complements the arcuately shaped groove 256 to form a substantially Vcircular guide adapted to receive, for reciprocation there in, anelongated substantially cylindrical member 266.

The cylindrical member 266 is provided with a closure wall 268 againstwhich one end of a helicoidal spring 270 is adapted to engage. The otherend of the "spring 270 t.

is adapted to engage against the end walls 272 formed in each of thesideWalls 202, 226 adjacent their respective rear ends 206, 230. The closurewall '268 is conside wall 202, the front end stantly biased forengagement against the rear end 274 of an elongated polygonal plate 276.The plate 276 is provided with an elongated slot 278, the major axis ofwhich lies on an angle of with respect to a projection of the horizontaldiameter of the dowel pin 264. The dowel pin 264 extends through theslot 278 to afford the plate 276 pivotal and sliding movement.

The polygonal, plate 276 has a front end 280 which extends substantiallyparallel to the rear end 274, and the upper end- 282 is disposed in aplane substantially perpendicular to both the front and rear ends 280,274, respectively. The side 284 is disposed at a substantially 45 anglewith respect to the front and rear ends 280, 274, and the inner end ofthe side 284 junctions with theinner end of the side 286 at an obtuseangle.

The dowel pin 262, supported in dowel pin opening 222, the arcuatelyshaped groove 252, and the dowel pin opening 258, limits thecounter-clockwise movement of the plate 276 so that the angle of45",referred to above, is never lessened with respect to a projection of thevertical diameter of the pin 264.

A pair of brackets 288 are provided, one on each side of the assembledgage 200, and the brackets are under cut at 290 to provide shoulders 292which are adapted to engage within the grooves 218 and 238 formed in theside walls 202, 226, respectively. The brackets 288 secure the gage 200to the bed plate of a punch press or other similar machine, the bracketsbeing fixedly secured as by a plurality of bolts 294 which pass throughopenings 296 formed therein.

A pressure pad 298 is positioned above the upper end 282 of the plate276, and the work 300 is fed to the gage 200 in the same manner aspreviously described.

Inasmuch as the function of the plate 276, the pressure pad 298, and thefaces 212 and 236 are identical to the functions ascribed to theircounter-parts in the preceding embodiment, it is not believed necessaryto reiterate the same at this point.

The third embodiment of this invention is stamped from a one piece sheetof metal and is illustrated in Figures 7 to 10, inclusive. Asillustrated therein, the gage 400 is seen to comprise a substantiallyU-shaped housing 402 having a pair of oppositely disposed substantiallyspaced and parallel side walls 404 and 406. The upper ends of the sidewall 404 are connected by a bight portion 408 which extends from therear end of the gage 400 and terminates at a point substantiallycentrally thereof.

The lower end of the side wall 404 is provided with a pair of elongatedsubstantially rectangular spaced flanges 410, 412 which projectlaterally and outwardly therefrom. The lower end of the side wall 404 isalso provided with a pair of notches 414 and 416 which serve a functionto be described.

The lower end of the side Wall 406 is provided with a pair of spacedflanges 418, 420 which are bent laterally outwardly, and a pair offlanges 422 and 424 which are bent laterally and inwardly. The flanges422 and 424 are provided with reduced end portions 426 and 428,respectively, and are adapted to be received within the notches 414 and416 with the outer ends of the flanges 422 engaging adjacent confrontingsurfaces of the side wall 404.

The side walls 404, 406 are each provided with longitudinally extendingsubstantially arcuately shaped expressed portions 430, 432 which, whenthe gage 400 is assembled, extend substantially parallel to each otherin spaced confronting relationship.

The rear end of the gage 400 is provided with a closure wall 434 whichis integrally formed with the side wall 404.

A pair of aligned 'dowel pin openings 436, 438 extend transverselythrough the side Walls 404, 406, respectively. These dowel pin openingsare adapted to receive and support therein a dowel pin 440.

A second pair of dowel pin openings442 and 444 are formed in the sidewalls 404 and 406, the latter pair of dowel pin openings being alignedand receive therein the opposite ends of a dowel pin 446.

An elongated polygonal plate 448 is provided with an elongated opening.or slot 450 which is adapted to receive therein the dowel pin 446.

An elongated substantially cylindrical member 452 is mounted forreciprocation within the arcuately shaped grooves 430, 432 and is formedwith a closure member 454 at one end thereof. One end of a helicoidalspring 456 engages against the closure wall 454 while the other endthereof abuts against the closure wall 434, thus constantly biasing thecylindrical member for movement to the right as viewed in Figure 8 ofthe drawings. Thus the end wall 454 constantly engages against the rearside 458 of the plate 448. The rear side 458 of the plate 448 issubstantially parallel to the front side 460, and both the front andrear sides are substantially perpendicular to the upper end 462 thereof.

The side 464 extends at an angle of 45 with respect to the front andrear sides of the plate 448 and at the same angle with respect to aprojection of the vertical diameter of the dowel pin 446. At its innerend, the side 464 junctions with the side 466 forming an obtuse angle.The dowel pin 440, as in the preceding cases limits the counterclockwisemovement of the plate 448. The major axis of the slot 450 is againcritical and extends at an angle of 15 with respect to a projection ofthe horizontal diameter of the dowel pin 446.

Downward movement of the plate 448 is effected by the pressure pad 468in order to release the work 470.

Brackets 472 having longitudinally extending flanges 474 are secured tothe bed of a punch press (not shown) by bolts 476, the flanges 474thereof being superimposed over the flanges 410, 412, 418 and 420.

The operation of this gage is identical to those previously described.

Having described and illustrated three embodiments of the presentinvention, it will be understood that the same are offered merely by wayof example, and that the invention is to be limited only by the scope ofthe appended claims.

What is claimed is:

l. A material stop mechanism comprising a gage having a housing formedof a single sheet of material, said housing comprising a pair ofoppositely disposed spaced and substantially parallel side walls havingan integrally formed bight connecting the upper ends of said side wallsand extending from one end thereof to a centrally disposed point, a pinextending between and supported on said side walls forwardly of andproximate to the terminal inner end of said bight, a second pinextending between and supported on said side walls below said first pin,a polygonal plate having an elongated slot formed therein, said platebeing disposed between said side walls and receiving said second pintherethrough in said slot for pivotal and longitudinal reciprocalmovement relative to said side walls, a longitudinally extending arcuategroove formed in each of said side walls and disposed in confrontingrelation, an integrally formed end wall extending from one of said sidewalls across said one end thereof, a cylindrical member having a closedend disposed in said grooves for reciprocation therein, a resilientmember.having an end thereof engaging against said end wall and saidclosed end of said cylindrical member, said closed end of saidcylindrical member constantly engaging against a side of said plate tourge said plate for longitudinal and pivotal movement, said second pinbeing disposed in the path of movement of said plate to engage and thuslimit its movement in one direction, said plate having an end thereofnormally extending above the upper ends of said side walls in workengaging position, and means for securing said gage on a base.

2. A material stop mechanism as defined in claim 1,

and one ofsaid side walls having inwardly turned spaced flanges at thelower end thereof, the other of said side pair of oppositely disposedsubstantially parallel side walls,

means integral with at least one of said walls separating said walls inspaced relation, a pin extending between and supported on the upper edgeportions of said side walls adjacent'to and spaced from said means, asecond pin extending between and supported on said side walls below saidfirst pin, a polygonal plate having an elongated slot formed therein,said plate being disposed between said side walls and receiving saidsecond pin therethrough in said slot for pivotal and longitudinalreciprocal movement relative to said side walls, a longitudinallyextending arouate groove formed in each of said side walls and disposedin confronting relation, an integrally formed end wall extending fromone of said sidewalls across said one end thereof, a cylindricalmemberhaving a closed end disposed in said'grooves for reciprocationtherein, a resilient member having an end thereof engaging against saidend wall and said closed end of said cylindrical member 'said closed endof said .cylindrical'mernbe'r constantly engag ing against aside ofsaidplate'to urge 'said plate' for 1on gitudinal and pivotal movement, saidsecond being disposed in the path of movement of said plate -to "engageand thus limit its movement in one direction,- sa'id'plate having an endthereof normally extending above the up- 'per ends of said side walls inwork engaging 'positio'n, and

means for securing said gage on a base.- 7

References Cited in the file of this'patent UNITED STATES PATENTS,

2,059,010 Melin Oct. 27 ,"19 36 2,158,466 Little May 16, 1939 2,219,060West Oct. 22, 1940 2,589,033 Baumgartner Mar. 11, 19 52 FOREIGN PATENTS873,234 Germany Apr. 13, 1953

